testsuite: Add testcase for already fixed PR [PR110251]

This testcase started to hang at -O3 with r13-4208 and got fixed
with r14-2097.

2024-01-17  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/110251
	* gcc.c-torture/compile/pr110251.c: New test.